<template>
  <div class="scan" v-if="scancode">
    <qrcode-stream @decode="onDecode" @init="onInit" style="height: 100vh;">
      <div>
        <div class="qr-scanner">
          <div class="box">
            <div class="line"></div>
            <div class="angle"></div>
          </div>
        </div>
      </div>
    </qrcode-stream>
  </div>
</template>
<script>
// 下载插件
// cnpm install --save  vue-qrcode-reader
// 引入
import { QrcodeStream } from 'vue-qrcode-reader'
export default {
  // 注册
  components: { QrcodeStream },
  props: {
    scancode: {
      type: Boolean,
      default: false,
    }
  },
  data() {
    return {
      result: '', // 扫码结果信息
      error: '' // 错误信息
    }
  },
  created(){
    this.clickCode()
  },
  methods: {
    clickCode() {
      this.scancode=true;
    },
//回调扫描结果
    onDecode (result) {

      if(result!==""){
        this.scancode=false;
        this.$emit("ok",result)
      }

    },
// 检查是否调用摄像头
    async onInit (promise) {
      try {
        await promise
      } catch (error) {
        if (error.name === 'NotAllowedError') {
          this.error = "ERROR: 您需要授予相机访问权限"
        } else if (error.name === 'NotFoundError') {
          this.error = "ERROR: 这个设备上没有摄像头"
        } else if (error.name === 'NotSupportedError') {
          this.error = "ERROR: 所需的安全上下文(HTTPS、本地主机)"
        } else if (error.name === 'NotReadableError') {
          this.error = "ERROR: 相机被占用"
        } else if (error.name === 'OverconstrainedError') {
          this.error = "ERROR: 安装摄像头不合适"
        } else if (error.name === 'StreamApiNotSupportedError') {
          this.error = "ERROR: 此浏览器不支持流API"
        }
      }
    },
  }
}
</script>
<style lang="scss" scoped>
.error {
  font-weight: bold;
  color: red;
}
.scan{
  width: 100vw;
  border-color: #585858;
  position: fixed;
  top: 0;
  left: 0;
}
.qrcode-stream-camera{
  width: 100%;
  height: 100%;
  display: block;
  -o-object-fit: cover;
  object-fit: cover;
  position: absolute;
  top: 0%;
  left: 0%;
}
.qr-scanner {
  background-image:
      linear-gradient(0deg,
          transparent 24%,
          rgba(32, 255, 77, 0.1) 25%,
          rgba(32, 255, 77, 0.1) 26%,
          transparent 27%,
          transparent 74%,
          rgba(32, 255, 77, 0.1) 75%,
          rgba(32, 255, 77, 0.1) 76%,
          transparent 77%,
          transparent),
      linear-gradient(90deg,
          transparent 24%,
          rgba(32, 255, 77, 0.1) 25%,
          rgba(32, 255, 77, 0.1) 26%,
          transparent 27%,
          transparent 74%,
          rgba(32, 255, 77, 0.1) 75%,
          rgba(32, 255, 77, 0.1) 76%,
          transparent 77%,
          transparent);
  background-size: 3rem 3rem;
  background-position: -1rem -1rem;
  width: 100%;
  /* height: 100%; */
  height: 100vh;
  position: relative;
  background-color: #1110;

  /* background-color: #111; */
}

.qr-scanner .box {
  width: 213px;
  height: 213px;
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  overflow: hidden;
  border: 0.1rem solid rgba(0, 255, 51, 0.2);
  /* background: url('http://resource.beige.world/imgs/gongconghao.png') no-repeat center center; */
}

.qr-scanner .line {
  height: calc(100% - 2px);
  width: 100%;
  background: linear-gradient(180deg, rgba(0, 255, 51, 0) 43%, #00ff33 211%);
  border-bottom: 3px solid #00ff33;
  transform: translateY(-100%);
  animation: radar-beam 2s infinite alternate;
  animation-timing-function: cubic-bezier(0.53, 0, 0.43, 0.99);
  animation-delay: 1.4s;
}

.qr-scanner .box:after,
.qr-scanner .box:before,
.qr-scanner .angle:after,
.qr-scanner .angle:before {
  content: '';
  display: block;
  position: absolute;
  width: 3vw;
  height: 3vw;

  border: 0.2rem solid transparent;
}

.qr-scanner .box:after,
.qr-scanner .box:before {
  top: 0;
  border-top-color: #00ff33;
}

.qr-scanner .angle:after,
.qr-scanner .angle:before {
  bottom: 0;
  border-bottom-color: #00ff33;
}

.qr-scanner .box:before,
.qr-scanner .angle:before {
  left: 0;
  border-left-color: #00ff33;
}

.qr-scanner .box:after,
.qr-scanner .angle:after {
  right: 0;
  border-right-color: #00ff33;
}

@keyframes radar-beam {
  0% {
    transform: translateY(-100%);
  }

  100% {
    transform: translateY(0);
  }
}
</style>

